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Properties of substance:

potassium aluminium sulfate dodecahydrate


Physical appearance:

colorless cubic crystals

Empirical formula (Hill's system):

H24AlKO16S

Structural formula:

KAl(SO4)2 · 12H2O

Molar/atomic mass: 474.38

Melting point (°C):

92.5

Destruction point (°C):

120

Solubility (g/100 g of solvent):

water: 3 (0°C) [Ref.]
water: 4 (10°C) [Ref.]
water: 5.9 (20°C) [Ref.]
water: 7.23 (25°C) [Ref.]
water: 8.39 (30°C) [Ref.]
water: 11.7 (40°C) [Ref.]
water: 17 (50°C) [Ref.]
water: 24.75 (60°C) [Ref.]
water: 40 (70°C) [Ref.]
water: 71 (80°C) [Ref.]
water: 109 (90°C) [Ref.]
water: 119 (92.5°C) [Ref.]
ethanol: insoluble [Ref.]

Density:

1.75 (20°C, g/cm3)

    Dissociation:

    pKa (1) = 5.02 (25°C, water)

    Standard molar enthalpy (heat) of formation ΔfH (298 K, kJ/mol)

    -6063 (s)

    Standard molar Gibbs energy of formation ΔfG (298 K, kJ/mol)

    -5142 (s)

    Standard molar entropy S (298 K, J/(mol·K))

    687 (s)

    Enthalpy (heat) of solution ΔsolH (kJ/mol)

    42,31 (s)

    References:

    1. Девяткин В.В., Ляхова Ю.М. Химия для любознательных, или о чем не узнаешь на уроке. - Ярославль: Академия Холдинг, 2000. - pp. 78
    2. Лидин Р.А., Молочко В.А., Андреева Л.Л. Химические свойства неорганических веществ. - М.: Химия, 2000. - pp. 85
    3. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 52
    4. Энциклопедия для детей. - Т.17: Химия. - М.: Аванта+, 2004. - pp. 202
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru